Objective To evaluate diopter state and its distribution of children with subnormalvision at 4-6 years.
目的探索4 ~ 6岁视力低常儿童的屈光状态及其分布规律。
2
Objective to investigate the daily living vision and the corrected vision of the aged, and to analyze the reason of subnormalvision and the age specific eye diseases in the aged.